EcoFlow DELTA 2
- AC delivered · measured
895 Wh. Show source
verified source~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test)2026-07-04- output
1,800 W. Show source
claimed sourceus.ecoflow.com ↗- surge
2,700 W. Show source
claimed sourceus.ecoflow.com ↗- weight
12 kg. Show source
claimed sourceus.ecoflow.com ↗- recharge
72 min. Show source
claimed sourceus.ecoflow.com ↗
Balanced
#12 of 19
in the Midsize (1 kWh class) class
Lifted by Trust & reliability and Quiet / livability; held back by charging & solar.
Check current availability and pricing at the retailer.
Check price on AmazonSee alternatives to the EcoFlow DELTA 2 →At a glance
EcoFlow DELTA 2 is a midsize (1 kwh class) model best suited to camper. It supplies 1,800 W of continuous AC output. BatteryRank scores it 57 out of 100 within its size class.
Our verdict on the EcoFlow DELTA 2
The oldest unit we analyse, and the one with the best-provenanced capacity figure in the catalogue. Portable Power Lab ran it for six months and reported 890 to 900 Wh reaching AC from a 1,024 Wh rating — a long-run ownership result rather than a single bench pull, which is a stronger kind of evidence than most newer models have. Age shows in the 30 ms switchover and the 72-minute recharge, both bettered by its own successors.
- You want the model with the most testing behind it rather than the newest oneIts 86 to 90 percent delivered range comes from six months of use, where most units in our data offer a single measurement or none at all.
- You want plenty of sockets without moving up a size classSix AC outlets on a 1,024 Wh pack is unusually generous, and the 1,800 W continuous rating is enough that they are not merely decorative.
- You want the shortest possible gap when the grid dropsIts 30 ms switchover is the slowest in EcoFlow’s current line and sits at the edge of what a desktop power supply will ride through without rebooting. The DELTA 3 switches in 10 ms and refills in 56 minutes.
- You are planning around a multi-day outage rather than an eveningRoughly 900 Wh of delivered energy and a 2,048 Wh expansion ceiling put a firm limit on how far this platform grows. It starts at 4,096 Wh and expands to 48,000 Wh.
The honest limit: EcoFlow built this model’s reputation on fast charging, and 72 minutes was competitive when it launched. It is no longer the brand’s own best figure — the DELTA 3 does the same job in 56 minutes with a faster switchover — so the feature that once distinguished it is now the clearest sign of its generation.
What our data can’t tell you: The six-month test that produced our delivered-energy range did not publish the loads used, so the 86 to 90 percent spread cannot be attributed to specific conditions. We also have no independent verification of how the pack has aged against its 3,000-cycle rating, which is the question a six-month result is closest to answering and did not.
BatteryRank Engineering Team · Last reviewed · Method
Capacity truth
The watt-hour number on the box isn't what reaches your devices. Rated on the label vs what actually leaves an outlet.
1,024 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-10The marketing number — total cell capacity.
890–900 Wh. Show source
verified source~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test)2026-07-04~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test) · 13% below the label
Also independently measured
- AC inverter efficiency
86–90 %. Show source
verified source~86-90% (Portable Power Lab measured)2026-07-04- Fan noise
20–22 dB. Show source
verified source~20-22dB (<50W load) up to ~48-55dB (1000-1800W load) (Portable Power Lab measured); also called "LOUD"/"NOISY" under load by PCWorld and GreenCitizen reviews2026-07-04- AC charge time
80–90 min. Show source
verified sourceOEM manual: 72 min full charge; third-party estimates ~50min to 80% / ~80-90min full (backuppowerhub.com, wattbunker.com) — not OEM-confirmed2026-07-04- Solar performance
—. Show source
verified source2x220W EcoFlow panels ~3-4h full charge in optimal sun; ~5-6h realistic mixed-sun (Backup Power Hub)2026-07-04
~86-90% (Portable Power Lab measured)
~20-22dB (<50W load) up to ~48-55dB (1000-1800W load) (Portable Power Lab measured); also called "LOUD"/"NOISY" under load by PCWorld and GreenCitizen reviews
OEM manual: 72 min full charge; third-party estimates ~50min to 80% / ~80-90min full (backuppowerhub.com, wattbunker.com) — not OEM-confirmed
2x220W EcoFlow panels ~3-4h full charge in optimal sun; ~5-6h realistic mixed-sun (Backup Power Hub)
What it can run
Same sourced device assumptions used by our calculators, applied to this model's usable AC energy. Actual runtime varies with load, temperature, and standby draw.
| Device | Estimated runtime | Sourced assumption |
|---|---|---|
| CPAP (humidifier off) | about 12.4 nights | 9 W · |
| CPAP (heated humidifier on) | about 2.0 nights | 56 W · |
| Refrigerator (full-size) | about 14 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 50 hours | 18 W · |
| Laptop (65W charger) | about 28 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 44 full charges | 20 W · |
Who it fits
Mechanical matches against this model's own sourced specs — never invented sentiment, never a guess on a spec we don't have.
12 kg with 500 W solar input → carry-in, solar-rechargeable
895 Wh AC-delivered (measured) → multiple CPAP nights per charge
1800 W inverter, 895 Wh AC-delivered (measured) → runs a fridge through an outage
How it scores
Four buyer pillars over seven sub-scores — computed from sourced data with a published formula, price-independent by design.
Power
Battery-side usable capacity and how much you can run at once.
Usable watt-hours and how far you can grow it with add-on batteries, versus its size class.
Continuous and surge wattage, outlet count, and USB-C fast-charging.
Trust
Owner reputation, safety record, warranty, and build durability.
Owner ratings, brand reputation, recall record, and warranty backing.
Rated cycle life, warranty length, cell chemistry, and weather sealing.
Charging
Wall and solar recharge speed.
Wall recharge speed, solar input, and multi-source charging.
Livability
Lightweight, portable, and quiet enough to live with.
Weight, footprint, handle, and wheels, versus its size class.
Fan noise under load — quieter is better for bedrooms and CPAP use.
How this score is computed
The BatteryRank score is computed from sourced data with a published formula — ranked by data, not lab testing. Seven sub-scores blend into a 0–100 composite, grouped into four buyer pillars. Price is deliberately not a scoring input: prices move daily, so value intelligence lives in the price section above, judged against this model's own history.
| Pillar | Built from |
|---|---|
| Power | Capacity & expansion + Output & versatility |
| Trust | Trust & reliability + Durability & longevity |
| Charging | Charging & solar |
| Livability | Portability + Quiet / livability |
Scores are cohort-relative — each model is ranked against others in its size class. Missing inputs renormalize out rather than scoring zero (a model is never penalized for a spec nobody in its class publishes), and any figure resting on a documented estimate is tagged est. A full methodology page is coming.
Full specifications
Manufacturer-claimed unless marked verified (FCC/UL/DOE/lab). Tap or focus a figure to view its source.
Capacity & battery
- Battery-side usable capacity
1,024 Wh. Show source
claimed sourceus.ecoflow.com ↗- Rated cycle life
3,000 cycles. Show source
claimed sourceus.ecoflow.com ↗- Battery chemistry
LiFePO4. Show source
claimed sourceus.ecoflow.com ↗- Max capacity with expansion
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗- Rated capacity
1,024 Wh. Show source
claimed sourceus.ecoflow.com ↗- Cycle-life threshold
80 %. Show source
claimed sourceus.ecoflow.com ↗
Energy available from the battery before output-conversion losses. AC-delivered capacity is shown separately in Capacity Truth.
How many full charge-and-drain cycles before the battery drops to its rated threshold (shown alongside — brands rate to different thresholds, so never compare bare cycle counts).
The type of battery cell. LiFePO4 (LFP) cells last far more cycles and are more thermally stable than older lithium-ion (NMC) cells.
The largest total capacity this unit can reach once you add every supported expansion battery.
The battery's nameplate energy capacity — the headline number on the box. Battery-side usable and AC-delivered capacity are shown separately.
The remaining-capacity level the cycle rating is measured to. 3,000 cycles to 80% is a stronger battery than 3,000 cycles to 70% — always read the two numbers together.
Power output
- Continuous power output
1,800 W. Show source
claimed sourceus.ecoflow.com ↗- Surge power output
2,700 W. Show source
claimed sourceus.ecoflow.com ↗- AC outlets
6 outlets. Show source
claimed sourceus.ecoflow.com ↗- USB-A ports
4 ports. Show source
claimed sourceus.ecoflow.com ↗- USB-C ports
2 ports. Show source
claimed sourceus.ecoflow.com ↗- USB-C max output
100 W. Show source
claimed sourceus.ecoflow.com ↗- 12V car ports
1 ports. Show source
claimed sourceus.ecoflow.com ↗- DC barrel ports
2 ports. Show source
claimed sourceus.ecoflow.com ↗- Max combined output
1,800 W. Show source
claimed sourceus.ecoflow.com ↗
The most power you can draw at once, sustained — this has to be higher than the running wattage of whatever you're plugging in.
A brief power spike the unit can absorb when a device first switches on — matters for things with motors or compressors, like fridges.
How many standard wall-style outlets are built in.
How many USB-A ports are built in, for charging older phones, lights, and accessories.
How many USB-C ports are built in — check the per-port wattage below if you need fast charging for a laptop.
The fastest a single USB-C port can charge a device — relevant for laptops and fast-charging phones.
How many car-socket (cigarette-lighter) style 12V outputs are built in — what CPAPs and car fridges plug into for the most efficient overnight running.
How many round barrel-style DC outputs are built in, used by routers, some lights, and older electronics.
The most power the unit can deliver across ALL ports at the same time — can be lower than the AC rating plus every USB port added up.
Charging & solar
- AC recharge speed
1,200 W. Show source
claimed sourceus.ecoflow.com ↗- AC charge time (0–100%)
72 min. Show source
claimed sourceus.ecoflow.com ↗- Max solar input
500 W. Show source
claimed sourceus.ecoflow.com ↗
How fast the unit recharges from a wall outlet — higher means shorter waits between uses.
How long a full recharge takes from a wall outlet, start to finish.
The most solar panel wattage the unit can accept — undersized panels just mean slower charging, not damage, but oversizing this is wasted money.
Reliability & durability
- UPS switchover time
30 ms. Show source
claimed sourceus.ecoflow.com ↗
How fast the unit takes over when grid power cuts out. Under ~20ms is fast enough that most electronics — including many CPAP machines — won't even blip.
Size & portability
- Weight
12 kg. Show source
claimed sourceus.ecoflow.com ↗
How much the unit weighs on its own, without accessories — relevant for portability and carrying it up stairs during an outage.
What reviewers & owners report
Named outlets and marketplaces, each rating credited where it was published.
- fastest-charging in its class at 2022 launch — Across reviewers ·
- proven long-running bestseller — Across reviewers ·
- expandable to 2048Wh — Across reviewers ·
- 5-yr warranty — Across reviewers ·
- LFP 3000-cycle — Across reviewers ·
- wide port count (15 total) — Across reviewers ·
- solid build after 6mo+ real use — Across reviewers ·
- fan noise flagged as loud under heavy load — Across reviewers ·
- 1800W base (2200W X-Boost) limits largest appliances — Across reviewers ·
- no official IP rating — Across reviewers ·
- 500W solar input lower than newer-gen EcoFlow models — Across reviewers ·
- Popular Mechanics: none
- Wirecutter: none
- widely covered by portable-power YouTube/blog reviewers as a benchmark 1kWh-class pick since its 2022 launch — YouTube reviewers ·
- no single measured consensus captured — YouTube reviewers ·
Brand reputation: Long-running bestselling SKU since Sept 2022 launch; still a top-selling 1kWh-class unit on Amazon as of 2026 per aggregator trackers; 5-yr warranty; fan noise widely flagged in reviews (PCWorld "LOUD", GreenCitizen "NOISY"). Brand-level: EcoFlow DELTA Max 2000 (EFD310) fire recall 2025-10 — DIFFERENT older/separate product, not DELTA 2
Sources: ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com DELTA 2 User Manual (OEM, accessed 2026-07-10); us.ecoflow.com/products/delta-2-portable-power-station accessed 2026-07-10; amazon.com/dp/B0B9XB57XM accessed 2026-07-10; portablepowerlab.com/ecoflow-delta-2-review (6-month real-use test); backuppowerhub.com/ecoflow-delta-2-review; wattbunker.com/blog/ecoflow-delta-2-specs; storagereview.com/review/ecoflow-delta-2-review; cpsc.gov recall search checked 2026-07-10
What else to consider instead of the EcoFlow DELTA 2
Same or adjacent size class, ordered by the price-independent composite. Every alternative is better than the EcoFlow DELTA 2 at something and worse at something else, so each row states both halves — each one arithmetic on two sourced readings, with a dimension skipped rather than guessed when either side is missing a figure.
- EcoFlow DELTA 3 Plusscore 72 · same size class
- Why you would switch
- The EcoFlow DELTA 3 Plus takes 100% more rated solar input (1,000 W vs 500 W) for off-grid recharging.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 2 leads on no compared dimension by a margin worth acting on.
- DJI Power 1000 V2score 71 · same size class
- Why you would switch
- The DJI Power 1000 V2 carries 44% more continuous output (2,600 W vs 1,800 W), which decides what it can run at all.
- What you give up
- The EcoFlow DELTA 2 is 14% lighter (12 kg vs 14 kg).
- Anker SOLIX C1000 Gen 2score 68 · same size class
- Why you would switch
- The Anker SOLIX C1000 Gen 2 carries 11% more continuous output (2,000 W vs 1,800 W), which decides what it can run at all.
- What you give up
- The EcoFlow DELTA 2 supports add-on batteries, so capacity can grow later.
- EcoFlow DELTA 3score 68 · same size class
- Why you would switch
- The EcoFlow DELTA 3 reaches a full AC charge in 56 minutes against 72.
- What you give up
- Nothing the sourced data can show — the EcoFlow DELTA 2 leads on no compared dimension by a margin worth acting on.
- Bluetti Elite 100 v2score 67 · same size class
- Why you would switch
- The Bluetti Elite 100 v2 delivers 12% more usable AC energy (1,000 Wh vs 895 Wh).
- What you give up
- The EcoFlow DELTA 2 supports add-on batteries, so capacity can grow later.
Quick answers
Each answer restates a sourced figure from elsewhere on this page — nothing new, nothing guessed.
- How much does the EcoFlow DELTA 2 weigh?
- 12 kg (26.5 lb), manufacturer-claimed, without accessories.
- What are the dimensions of the EcoFlow DELTA 2?
- 400 × 211 × 281 mm (15.7 × 8.3 × 11.1 in), length × width × height, manufacturer-claimed.
- How much capacity does the EcoFlow DELTA 2 deliver through an AC outlet?
- About 895 Wh of the rated 1,024 Wh reaches an AC outlet from a full charge — measured in independent testing.
- How long does the EcoFlow DELTA 2 take to charge?
- 1 h 12 min from a wall outlet, 0 to 100%, manufacturer-claimed. Fast-charge modes and solar input differ — see the charging specs on this page.
- How many watts can the EcoFlow DELTA 2 output?
- 1,800 W continuous AC output and 2,700 W surge output, manufacturer-claimed. Appliance startup demand must stay within the relevant limit.
- How much solar input can the EcoFlow DELTA 2 accept?
- 500 W maximum solar input, manufacturer-claimed. Actual harvest depends on panel compatibility, sun, orientation, temperature, and conversion losses.
- What is the cycle-life rating of the EcoFlow DELTA 2?
- 3,000 cycles to 80% remaining capacity, manufacturer-claimed. A cycle rating is not a calendar-life guarantee.
- Can the EcoFlow DELTA 2 work as a UPS?
- Its manufacturer-claimed transfer time is 30 ms. Confirm that your connected equipment tolerates that transfer time; this is not the same as a zero-transfer online UPS.
- How far can the EcoFlow DELTA 2 expand?
- Up to 2,048 Wh with compatible expansion hardware, manufacturer-claimed. The base-unit capacity and expansion-system capacity are shown separately.